<pre>  /**
   * The constants used in this Content Widget.
   */
  public static interface CwConstants extends Constants {
    String cwMessagesExampleArg0Label();

    String cwMessagesExampleArg1Label();

    String cwMessagesExampleArg2Label();

    String cwMessagesExampleDescription();

    String cwMessagesExampleFormattedLabel();

    String cwMessagesExampleLinkText();

    String cwMessagesExampleName();

    String cwMessagesExampleTemplateLabel();
  }

  /**
   * The {@link TextBox} where the user enters argument 0.
   */
  private TextBox arg0Box = null;

  /**
   * The {@link TextBox} where the user enters argument 1.
   */
  private TextBox arg1Box = null;

  /**
   * The {@link TextBox} where the user enters argument 2.
   */
  private TextBox arg2Box = null;

  /**
   * An instance of the constants.
   */
  private final CwConstants constants;

  /**
   * The error messages used in this example.
   */
  private ErrorMessages errorMessages = null;

  /**
   * The {@link HTML} used to display the message.
   */
  private HTML formattedMessage = null;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    // Create the internationalized error messages
    errorMessages = GWT.create(ErrorMessages.class);

    // Use a FlexTable to layout the content
    FlexTable layout = new FlexTable();
    FlexCellFormatter formatter = layout.getFlexCellFormatter();
    layout.setCellSpacing(5);

    // Add a link to the source code of the Interface
    final String rawFile = getSimpleName(ErrorMessages.class);
    Anchor link = new Anchor(rawFile);
    link.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        fireRawSourceRequest(rawFile + ".java");
      }
    });
    HorizontalPanel linkPanel = new HorizontalPanel();
    linkPanel.setSpacing(3);
    linkPanel.add(new HTML(constants.cwMessagesExampleLinkText()));
    linkPanel.add(link);
    layout.setWidget(0, 0, linkPanel);
    formatter.setColSpan(0, 0, 2);

    // Show the template for reference
    String template = errorMessages.permissionDenied("{0}", "{1}", "{2}");
    layout.setHTML(1, 0, constants.cwMessagesExampleTemplateLabel());
    layout.setHTML(1, 1, template);

    // Add argument 0
    arg0Box = new TextBox();
    arg0Box.setText("amelie");
    layout.setHTML(2, 0, constants.cwMessagesExampleArg0Label());
    layout.setWidget(2, 1, arg0Box);

    // Add argument 1
    arg1Box = new TextBox();
    arg1Box.setText("guest");
    layout.setHTML(3, 0, constants.cwMessagesExampleArg1Label());
    layout.setWidget(3, 1, arg1Box);

    // Add argument 2
    arg2Box = new TextBox();
    arg2Box.setText("/secure/blueprints.xml");
    layout.setHTML(4, 0, constants.cwMessagesExampleArg2Label());
    layout.setWidget(4, 1, arg2Box);

    // Add the formatted message
    formattedMessage = new HTML();
    layout.setHTML(5, 0, constants.cwMessagesExampleFormattedLabel());
    layout.setWidget(5, 1, formattedMessage);
    formatter.setVerticalAlignment(5, 0, HasVerticalAlignment.ALIGN_TOP);

    // Add handlers to all of the argument boxes
    KeyUpHandler keyUpHandler = new KeyUpHandler() {
      public void onKeyUp(KeyUpEvent event) {
        updateMessage();
      }
    };
    arg0Box.addKeyUpHandler(keyUpHandler);
    arg1Box.addKeyUpHandler(keyUpHandler);
    arg2Box.addKeyUpHandler(keyUpHandler);

    // Return the layout Widget
    updateMessage();
    return layout;
  }

  /**
   * Update the formatted message.
   */
  private void updateMessage() {
    String arg0 = arg0Box.getText().trim();
    String arg1 = arg1Box.getText().trim();
    String arg2 = arg2Box.getText().trim();
    formattedMessage.setText(errorMessages.permissionDenied(arg0, arg1, arg2));
  }

</pre>